[artist id="960668"]Sum-41[/artist] frontman Deryck Whibley has been hospitalized after being attacked by three people in a bar late last night in Japan, his bandmates tweeted. He's being treated for unspecified injuries.

There isn't much detail out there about the rocker — also the ex-husband of pop/punk singer Avril Lavigne — but Sum-41 posted a statement on their website for concerned fans: "It is unfortunate to say, but Deryck Whibley is still in the hospital. He was attacked late last night in Japan. We are waiting for results and we are hoping for the best. Thanks for your support."

According to E! News, Japanese police are investigating the incident, which comes on the heels of Sum-41 announcing Sunday they were forced to cancel three Warped Tour shows because Whibley contracted a bad case of bronchitis. The ailment threatens to mess up his voice permanently, the band said in a statement.

"We have been ordered by a physician to cancel a few of our upcoming Vans Warped Tour dates — Chicago, Minneapolis and Kansas City. Deryck has been diagnosed with a serious case of bronchitis, and singing could damage his voice permanently," the statement read. "The tour has been going amazing so far, and we wish Deryck a speedy recovery so we can continue rocking. We apologize to our fans in Chicago, Minneapolis and Kansas City, and we promise to return to these cities on our upcoming world tour."